Renewable fuse



1929. J. G. cLEMENs' 1,725,131

' RENEWABLE FUSE original Filed oct. 1,"1926 Patented Aug. 20, 1929.

UNITED STATES PATENT .ori-Ica JOHN G. CLEMENS, F EGGERTSVILLE, NEW YORK, ASSIGNOR T0 PIERCE RENEW- ABLE FUSES, INC., 0F BUFFALO, NEW YORK.

RENEWABLE FUSE.

Original application led October l, 1926, Serial No. 138,978. Patent No. 1,684,432, dated September 18 1928. Divided and this application filed March 23, 1928. Serial No. 264,238.

This invention relates to improvements in electric fuses of the kindin which a fuse link, after having been fused or burnt may be removed and replaced by another link.

This application. is a division of my Patent No. 1,684,432 dated September 18, 1928.

The objects of this invention are to provide a fuse of this kind with means for retaining in operative position at all times the nut of the bolt or screw which secures the removable link to the fuse terminal, so that the insertion of a new fuse link is facilitated; also to improve the construction of renewable fuses in other respects hereinafter specified.

In the accompanying drawings:

Fig. 1 is a longitudinal sectional elevation of a renewable fuse embodying this invention.

Fig. 2 is a transverse section thereof on line 2 2, Fig. 1.

Fig. 3 is a transverse sectional elevation of a fuse of somewhat modified construction. Fig. 4 is a longitudinal sectional view thereof on line 4.-4, Fig. 3.

The fuses to which the improvement embodying my invention are applied may be of any suitable or desired construction, that shown in the drawings including an outer shell or housing 10 of hard fibre or other suitable insulating material, and an inner shell or frame 11 of similar material which may be open at one side thereof as indicated at 12, through which opening in the frame a removable fuse link 13 may be inserted or removed from the' frame and through which opening the products of combustion resulting from the fusing or burning of the link may pass into the space between the housing 10 and the frame 11. 14 and 15 represent the usual blades of the fuse which extend into the interior ofthe inner frame or shell 11 and the inner portions of which form terminals 16 to which the fuse link 13 may be secured.

While the invention is herein illustrated witha blade type of fuse, it is not intended to limit the invention to use on fuses of this kind, since my improvements may be used in connection with fuses of the ferrule .or other types.

-The terminals 16, which in the particular construction illustrated are integral parts of the blade 14 and 15 are suitably secured to the ends of the frame or inner shell 11 by any suitable means such as pins 18, Fig. 1 extending through the frame 11 near the ends thereof and through the terminals or blades 16 and also through the cup shaped member 19 arranged within each end of the frame or inner shell 11 ,of the fuse.

The outer housing 10 is provided at one end with a ferrule 20 rigidly secured thereto in any desired manner, which ferrule is provided at its end with an inwardly extending flange 21 having a hole therein large enough to permit the blade 14 to pass therethrough and to permit the ferrule 20 to be rotated about its axis relatively to the blade. At the other end of the outer housing 10 a fcr'rule 22 is provided having an'inwardly extending flange 23 which is suitably connected rigidly to the blade 15 so that there is no relative movement between the blade 15 and ferrule 22, and this ferrule 22 has an internal screw thread adapted to engage with a screw threaded part on the end of the outer housing 10. Consequently the ferrule 22 is secured on the inner frame 11 of the fuse and the ferrule 20 is secured to the outer housing or shell 10. When the ferrule 22 is turnedwith reference to the outer housing 10 to disconnect these two parts, the entire inner housing or frame 11 can be re-` moved from the outer housing or tube 10 llengthwise thereof, and when the ferrule 22 is screwed tightly upon the threaded end of the outer housing or shell 10, the inner frame 11 is securely clamped between the inwardly extending fianges of the two ferrules 20 and 22.

When the fuse link 13 blows, the products of combustion pass from the frame 11 of the fuse out through the opening 12 thereof into Jgie annular space between this frame and t e outer shell 10 of the fuse, and then pass Ainto the cup-shaped members 19 through a series of orifices 25, Fig. 1, which orifices extend through the wall of the frame 11 and of the cup-shaped members 19 so that the gases of combustion are expanded in the chambers 19 and cooled by this expansion. From the chambers 19 the gases flow through a plurality of disks or sheets 26 of any suitable reticulated material, such as fine wire mesh, gauze or perforated metal,

or metallic screening material which further cools the gases." These gases then pass to the atmosphere through openings 27 in' a' disk 28 arrangedat each vend of the frame 11 of thefuse'an'd thus pass-out through the openings inthe ferrules 20 and 22. All of these parts have heretofore been used in connection with fuses ofthis and lof themselves constitute no' part of this invention.

A,In fuses of 'this-kind theifuse links 13 'are 'l generally securedl to the terminals or Shanksk 16 of the' fuse blades 14 and 15 by means (if-screws or bolts 35 whichpass through holes in the shanks or terminals 16 and the threadedendslof- Which engage vin corre' spondingly threaded nuts 36. Trouble has minals 1 6, cooperating parts are provided on the ffuse terminals 16 and the nuts so that the displacementof-l the nuts out ofl their operative positions is prevented. In the construction shown, the nuts 36 are preferably provided withpunchedholes which are afterwards threaded to Vreceive the threaded portions of the screws or bolts 35, and in punchingthe hole in the nuts, a burr 37 is formed'around the hole in the nut.

vThe holes 38 .-in the fuse terminals or Shanks `16 are formed' large enough to permit the' burrs on the nuts to enter into the holes in the shanks orvterminals 16 before these parts are assembled inthe frame 11 of the fuse. The parts of the fuse are also so proportioned that the edges or corners of the nuts will be located adjacent to the inner wall ofthe tubular frame 11 of the fuse and consequently/ if the screw or bolt 35 is removed from-the fuse, the inner wall will limit the movement of the nut away from the terminal 16 so vthat the burrv can not move out of engagement with the hole in the terminal. This burr in turn prevents the nut from moving out of its operative position lengthwise of the frame -11 of the fuse. Consequently the screw or bolt 35 can readily -be 4again placed into its operative position inthe nut.

, -In thev construction shown in Figs'. 3 and 4 'the' nuts 40 vare heldin place Vby means of a turned over portion 41 of the end of the vshank or terminal 16, so that this bent over portion 41, together with the-adjacent portion of the frame. 11 of the fuse, will prevent the nut 40 from getting out of its operative position.

By means of either of Vthese-two constructions the removal and replacing-of a fuse link is greatly facilitated and the losing of. anut is prevented and also the nutis forcedl to remain in an operative position so that the threaded hole in the nut is substantially in alignment with the hole/in the shank or terminal,16, so thatv the replacing of the screw or bolt 35 can bev fected. i

I claim as my invention:

' l. A .fuse having a frame, a terminal eX-` tending into said frame and to which a fuse link may be secured, a bolt passing through said terminal, a nut withwhich said bolt cooperates, said nut being 'limited inl its,

movement away from said terminal by said frame, and cooperating parts Von said nut and terminal for,preventing.the movement of said nut lengthwise of said terminalout of operative relation thereto.

2. A fuse havinga frame,j a terminal ex:

tending into said frame and to which a fuse link may be Secured, a boltpassing through a4 hole in said terminal, a r nut having a quickly efy threaded hole with which said'bolt cooperates, and a projecting portion on saidy nut surrounding the hole therein and adapted' to extend into the hole in said terminal to prevent displacement of said nut out of operative relation to said terminal.'

3. A fuse having a frame, a terminal extending into said frame and to which a fuse link may be secured, a bolt passing through hole in said terminal, a nut having a threaded` hole with which said bolt cooperates, and a burr formed on a face of said nut and surrounding the hole therein and ,adapted 'to prevent displacement of said nutin the direction of said face thereof, a part of said frame extending into proximity to the opposite face ofsaid nut to prevent said bur; from moving out of said hole in said terminal byi limiting L the movement vof said nut relatively to' Said ter- 'miial at right angles to the faces of said nu JOHN G. CLEMENS. 

